Capital Square, Edinburgh

Capital Square is a landmark office development in the heart of Edinburgh City which when complete will offer over 122,000 sq.ft of Grade A accommodation.

The site of the new building involved redevelopment of the redundant Skypark building on Morrison Street, and the adjacent Capital House car park.

The site location was completely surrounded by existing buildings so logistics had to be planned very carefully in order to minimise the impact on the local community which included the prestigious Sheraton Hotel located immediately adjacent to the site.

Mait HR260 piling rig installing contiguous bored wall piles

P J Edwards & Co (UK) Ltd were employed by BAM Construction Ltd to initially install a number of rotary bearing piles to allow advanced relocation of a critical electrical substation, and then to subsequently install bored pile retaining walls around the perimeter of the site to facilitate excavation and construction of the basement for the new building.

In carrying out the works a combination of bored pile retention systems were used including both permanent contiguous bored pile walls, and temporary kingpost bored piles.

The permanent contiguous bored pile wall was formed using a combination of 50no. 750mm and 900mm diameter piles which were all installed using traditional techniques using segmental temporary casing.